Bosch Washer Error Code E38 — What It Means & How to Fix It

What Does This Error Mean?

The E38 error means your Bosch washer's water level sensor — also called the pressure sensor or pressure switch — is not working correctly. This sensor monitors how much water is in the drum at all times. Without reliable water level data, the machine cannot safely manage filling, washing, or draining. The washer stops to prevent overfilling or running dry, both of which can cause damage.

Affected Models

Bosch 300 Series
Bosch 500 Series
Bosch 800 Series
Bosch WAT28400UC
Bosch WFMC2201UC
Most Bosch front-load washing machines

Common Causes

The pressure sensor has failed due to age or a manufacturing defect
The pressure chamber tube connecting the drum to the sensor is kinked, clogged, or disconnected
Detergent foam or residue has entered and blocked the pressure chamber tube
Moisture has entered the sensor housing and damaged the internal components
The control board cannot correctly read the signal from a still-working sensor due to a board fault

How to Fix It

Unplug the washer and wait 60 seconds, then plug it back in. Run a short cycle to see if E38 clears.

Temporary sensor communication errors can sometimes be resolved by a full power reset.
Check whether you have been using more detergent than recommended. Excess foam can enter the pressure chamber tube and block it, giving the sensor false readings.

Switch to HE detergent if you are not already using it. Use the minimum recommended dose.
Unplug the washer and locate the pressure chamber tube — it is a small plastic or rubber tube that runs from the bottom of the drum tub up to the pressure sensor near the top or side of the machine.

On most Bosch front-load washers, you need to remove the top panel to access the pressure sensor and its tube.
Disconnect the tube from both the drum port and the sensor. Blow gently through it to check for blockages. Clear any foam residue with a thin brush or a rinse of warm water.

A blocked tube is a common cause of E38 that can be fixed without replacing any parts.
If the tube is clear and E38 persists, the pressure sensor needs replacing. Contact a Bosch-authorized technician for diagnosis and repair.

Describe E38 and mention any history of excess suds or detergent use — this helps the technician narrow down the cause quickly.

When to Call a Professional

Pressure sensor replacement is a moderate repair that a Bosch-certified technician handles routinely. The pressure sensor itself costs $30 to $70. Total repair with labor typically runs $120 to $220. Contact Bosch service at 1-800-944-2904 to check your warranty and schedule service.

Frequently Asked Questions

What is a pressure sensor and how does it work?

The pressure sensor — also called a pressure switch — measures air pressure in a sealed tube connected to the bottom of the drum. As water fills the drum, it pushes air up through the tube. The higher the water level, the greater the air pressure at the sensor. The control board reads this pressure to know exactly how much water is in the drum at any moment. If the sensor gives incorrect readings, the machine can fill too much, too little, or fail to drain correctly.

Is E38 an urgent repair?

You should not run laundry cycles while E38 is active. Without a working water level sensor, the machine could theoretically overfill, which risks flooding. It could also underfill, which means clothes will not be washed properly. Stop using the washer for regular loads until the sensor or tube is inspected and repaired.

Can I check the pressure sensor myself?

You can do a basic visual check of the tube for blockages. Actually testing the sensor requires a multimeter and some knowledge of sensor resistance values — this is more of a technician task. If the tube is clear and the error persists, the safer path is calling a Bosch-authorized technician rather than replacing parts by trial and error.